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benzo'ic ac'id

Chem.,Pharm.a white, crystalline, slightly water-soluble powder, C7H6O2, usually derived from benzoin or other balsams, or synthesized from phthalic acid or toluene: used chiefly as a preservative, in the synthesis of dyes, and in medicine as a germicide. Also called benzenecarboxylic acid, phenylformic acid.